#728 [Debian] Meaningful defaults for MAXFDS

I believe the init script should have meaningful defaults concerning the maximum file descriptors. This is especially important, when using the standard file backend. I propose the logic of the tor daemon:
```
# Let's try to figure our some sane defaults:
if [ -r /proc/sys/fs/file-max ]; then
system_max=`cat /proc/sys/fs/file-max`
if [ "$system_max" -gt "80000" ] ; then
MAX_FILEDESCRIPTORS=32768
elif [ "$system_max" -gt "40000" ] ; then
MAX_FILEDESCRIPTORS=16384
elif [ "$system_max" -gt "10000" ] ; then
MAX_FILEDESCRIPTORS=8192
else
MAX_FILEDESCRIPTORS=1024
cat << EOF
Warning: Your system has very few filedescriptors available in total.
Maybe you should try raising that by adding 'fs.file-max=100000' to your
/etc/sysctl.conf file. Feel free to pick any number that you deem appropriate.
Then run 'sysctl -p'. See /proc/sys/fs/file-max for the current value, and
file-nr in the same directory for how many of those are used at the moment.
EOF
fi
else
MAX_FILEDESCRIPTORS=8192
fi
```

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